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I too use a vac. It is care and moderation that is needed whether you suck or blow.
The danger with suction is allowing the nozzle to form a seal and so dislodge or damage the less robust parts of the innards.

I use a cheap small paintbrush to clean the fan blades and other accumulations, but always under the draft of the vac which nozzle is as close as possible to the scene

Blowing and particularly from an aerosol is expensive and though gentle, will scatter the dust willy nilly.
Having said that, it is whatever serves you best.

static can form around the plastic nozzle due to the flow of air so do not let the nozzle touch anything.

Whwn cleaning PC innards I use a hair dryer on cool low blow to shift the dirt and a small paint brush and a ladies nail dodah to scrape the fan blades an heatsinks clean witth all the gunk at the bottom of the machine finish off with a vac to get it out.

*Laptops require a different regime I do not recommend blowing anything into the vents *

a vac against the input grills may clear some of the dust and fluff

as yours is overheating and fan rattling I think you will need to open it up and scrape the fan blades and heat sinks clear off gunk. and use the vac to lift out the gunk

I've said it before and say it again--a small lilo type footpump from any hardware store, or even Argos, with a small nozzle allows you to use both hands and does the job better than condensed aircans or vacuum cleaners. I have been using this method for 2 years now without any problems. Cost about £10 or less and lasts for ever

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